A boozy Upper East Side party thrown by a teen while her wealthy parents were out of town turned into a violent, drunken melee that had to be broken up by cops and that left one kid hospitalized, sources said yesterday.

The Saturday-night rich kids’ bash at an East 71st Street residence got so out of hand that the normally quiet block was left strewn with broken glass, bottles and pools of vomit, shocked neighbors said.

Sources said the 16-year-old girl who threw the bash attends the exclusive Chapin School and had sent out invites saying she was raising money for it. She charged revelers $5 to get in.

Her mother and father – a financier – were away for the weekend, neighbors said.

Sources said cops got several 911 calls complaining about the bash, which was attended by some 80 private-school teens.

One 17-year-old partygoer, who attends the posh Upper West Side Collegiate School, was rescued by cops on East 72nd Street after his skull was fractured and his nose broken, sources said.

He was taken to New York Hospital.

A 16-year-old Collegiate student told police that a girl stole his jacket during the party and that he was attacked by a gang of boys when he asked for it back.

One neighbor who returned home as the party was breaking up was horrified to find vomit on her doorstep and in her garden, and the girl who had thrown the bash apologetically sweeping the street.

“There was broken glass all over the place. A lot of people had vomited in our doorway and in our neighbors’ areas,” said Daisy Paradis. “We weren’t too thrilled.”

Paradis said the party “was totally unruly. The kids were chugging whiskey from 9 o’clock.”

Another neighbor said, “You could hear that it was getting more and more violent. There was a lot of shouting and swearing.”

Paradis, a member of the block association, said neighbors planned to write to the girl’s parents, who refused to comment last night.